Ping, DNS lookup, IP lookup and network diagnostic tools.
Every Network tool — free, no sign-up, and nothing to install.
Look up domain registration details over the WHOIS protocol — registrar, dates, nameservers and the status codes that matter.
Look up every DNS record for a domain — A, MX, TXT, NS and more — with SPF, DKIM and DMARC problems explained.
Resolve a domain or IP to its network details — addresses, hosting provider, network owner and approximate location.
Find what an IP address points back to, and verify whether specific domains really share it.
Check a site's TLS certificate — expiry, hostname coverage, chain, protocol and cipher — before it takes the site down.
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